It is tea, there are tea seeds in it & green tea leaves, what looks like very small toasted rice, it tastes very much like a genmai cha. You can peel the husks from the brown seeds/nuts and there is a nut inside.

I have no clue, but I think I want to clarify what Poohblah said. It is not "Tea" as in tea from the Camillia Sinensis plant. It likely is some sort of Herbal Tisane. That is what really opens it up to be a whole gamut of things. Herbalists can get a little crazy with throwing a bunch of stuff together and calling it a tea that will help you with X, Y, and Z.

*Edit: On another note, if you are adamant that the leaves in there are actually from the tea plant, it could be a type of Korean Grain and Tea Leave blend. Though they do not look quite like a roasted Barley which is common in Korea. It could be some other grain though.

One possible way to tell is to brew it, and chew the grain after brewing. I'm not kidding. The Korean roasted corn tea is almost edible after brewing. I assume other grains would be chewable too. Then the taste might give you some hint